Evaluating air-blown gasification for energy recovery from wastewater solids: Impact of biological treatment and point of generation on energy recovery

Keywords

Decentralized water reclamation, Small-scale energy recovery, Gasification, Wastewater resource recovery facilities (WRRF), Internal combustion engine, Energy production

Abstract

Decentralized water reclamation is emerging as a new paradigm that pairs local wastewater resources with local users; however, one of the challenges that must be addressed to advance its implementation is the low energy efficiency associated with small treatment plants and the lack of available small-scale energy recovery technologies. Gasification is a technology that could be used to convert wastewater solids to energy at small wastewater resource recovery facilities (WRRF). A model developed for air-blown gasification coupled with internal combustion engine for energy production demonstrated that gasification of wastewater solids could produce up to one third of the electrical demand at a small WRRF. Results based on samples collected from local wastewater treatment plants show that the energy embedded in wastewater solids does not vary substantially with treatment processes implemented or point of solids generation, and thus gasification is feasible for a wide variety of WRRF sizes and processes. Further modeling revealed that feedstocks generated by three different processes have similar power output for one metric ton per day of solids gasified (∼20 kW), but the net power produced by a 19 ML/d WRRF varies more substantially (110–140 kW) because the mass of solids produced vary with each treatment scheme.

Original Publication Citation

Dotti F. Ramey, Nicholas P.G. Lumley, Ana L. Prieto, Jason M. Porter, Tzahi Y. Cath, Evaluating air-blown gasification for energy recovery from wastewater solids: impact of biological treatment and point of generation on energy recovery, Sustainable Energy Technologies and Assessments, vol. 9, (2015) pp. 22-29.

Document Type

Peer-Reviewed Article

Publication Date

2015

Publisher

Elsevier

Language

English

College

Ira A. Fulton College of Engineering and Technology

Department

Mechanical Engineering

University Standing at Time of Publication

Associate Professor

Link to Full Text

Share

COinS